Answer: 70 ft
Step-by-step explanation:
Given
height of book is measured by the function is

when the book is thrown 

The height of the book is 
Answer:
A
Step-by-step explanation:
I just plugged each variable into the equation. A is the only one that works.
1/6 of 24 = 4
3/7 of 21 = 9
1/3 of 21 = 7
The answer is 31 add 14 and 7 then subtract 52 by the 21 thus giving 31